:root {
  --line-border-fill: #3498db;
  --line-border-empty: #ffffff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: black;
  font-family: sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.container {
  text-align: center;
}

.progress-container {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
  width: 350px;
  position: relative;
  
}
.progress-container::before {
  content: '';
  background-color: var(--line-border-empty);
  height: 4px;
  width: 100%;
  position: absolute;
  top: 50%;
  /* margin-top: -2px; */
  transform: translateY(-50%);
  z-index: -1;
}

.progress{
  background-color: var(--line-border-fill);
  position: absolute;
  height: 4px;
  top:50%;
  transform: translateY(-50%);
  width: 0%;
  z-index: -1;
  transition: width 0.3s ease;
}

.circle{
  background-color: #fff;
  color:#999;
  height: 30px;
  width: 30px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  border: 3px solid var(--line-border-empty);
  transition: border-color 0.3s ease;
}

.circle.active{
  border-color: var(--line-border-fill);
}

.btn{
  background-color: var(--line-border-fill);
  color:#fff;
  border-radius: 5px;
  padding:8px 30px;
  border:0;
  font-size: 14px;
  margin:5px;
}

.btn:active{
  transform: scale(0.98);
}

.btn:focus{
  outline:0;
}

.btn:disabled{
  background-color: var(--line-border-empty);
  cursor: not-allowed;
}
